/Engine/Source/Runtime/GeometryCore/Public/CompGeom/Delaunay2.h
Get the triangulation as an array with a corresponding adjacency array, indicating the adjacent triangle on each triangle edge (-1 if no adjacent triangle)
void GetTrianglesAndAdjacency ( [TArray](API\Runtime\Core\Containers\TArray)< [FIndex3i](API\Runtime\GeometryCore\FIndex3i) > & Triangles, [TArray](API\Runtime\Core\Containers\TArray)< [FIndex3i](API\Runtime\GeometryCore\FIndex3i) > & Adjacency ) const